Overview
Microphthalmia with linear skin defects (MLS) syndrome, also known as MIDAS syndrome, is an X-linked disorder characterized by bilateral microphthalmia, linear skin defects following Blaschko lines, and often additional systemic anomalies 12.Diagnosis
Clinical Features: Bilateral microphthalmia, linear skin defects often following Blaschko lines, absence of sebaceous glands and vellus hairs in affected skin areas 1.
Imaging: CT scans to confirm microphthalmia and assess brain structures for anomalies such as agenesis of the corpus callosum 2.
Genetic Testing: Identification of deletions or mutations in the HCCS gene on Xp22.2 through DNA studies and FISH analysis 12.
Dermatoscopy: Useful for confirming aplastic nature of skin lesions, showing erythematous linear areas, absence of sebaceous glands, and vellus hairs 1.Management
Supportive Care: Addressing ocular complications with ophthalmological interventions tailored to microphthalmia 1.
Surgical Interventions: Consideration for surgical correction of associated anomalies like hypospadias, anal fistulas, or cardiac defects (e.g., secundum ASD) 2.
Genetic Counseling: Essential for families due to X-linked inheritance pattern 12.Special Populations
Pediatrics: Early ophthalmologic and dermatologic evaluations crucial for managing developmental and cosmetic impacts 12.
Comorbidities: Close monitoring for associated anomalies such as cardiac defects (ASD), genitourinary abnormalities (hypospadias), and central nervous system malformations (agenesis of corpus callosum, colpocephaly) 2.Key Recommendations
Perform genetic testing, including DNA studies and FISH analysis, to identify deletions or translocations in the Xp22.2 region for definitive diagnosis (Evidence: Moderate 12).
Utilize dermatoscopy to aid in diagnosing MLS/MIDAS syndrome by assessing skin lesion characteristics (Evidence: Moderate 1).
Offer comprehensive genetic counseling to families due to the X-linked nature of the syndrome (Evidence: Expert opinion 12).References
1 Almeida HL, Rossi G, Abreu LB, Bergamaschi C, Silva AB, Kutsche K. Dermatoscopic aspects of the microphthalmia with linear skin defects (MLS) syndrome. Anais brasileiros de dermatologia 2014. link
2 Stratton RF, Walter CA, Paulgar BR, Price ME, Moore CM. Second 46,XX male with MLS syndrome. American journal of medical genetics 1998. link1096-8628(19980226)76:1<37::aid-ajmg6>3.0.co;2-m)
3 Fitch N, Kaback M. The Axenfeld syndrome and the Rieger syndrome. Journal of medical genetics 1978. link